[Java] mysql+spring+mybatis实现数据库读写分离的代码配置

/** 
 * determine the current lookup key. this will typically be 
 * implemented to check a thread-bound transaction context. 
 * <p>allows for arbitrary keys. the returned key needs 
 * to match the stored lookup key type, as resolved by the 
 * {@link #resolvespecifiedlookupkey} method. 
 */
protected abstract object determinecurrentlookupkey();

<!--数据源 读写 --> 
<bean id="datasourcerw" class="org.logicalcobwebs.proxool.proxooldatasource"> 
  <property name="alias" value="ihotelrw"></property> 
  <property name="delegateproperties"> 
  <value>user=${jdbc.username},password=${jdbc.password} 
  </value> 
  </property> 
  <property name="user" value="${jdbc.username}" /> 
  <property name="password" value="${jdbc.password}" /> 
  <property name="driver" value="${jdbc.driverclassname}" /> 
  <property name="driverurl" value="${jdbc.url}" /> 
  <property name="maximumconnectioncount" value="${jdbc.maximumconnectioncount}"></property> 
  <property name="maximumactivetime" value="${jdbc.maximumactivetime}"></property> 
  <property name="maximumconnectionlifetime" value="${jdbc.maximumconnectionlifetime}"></property> 
  <property name="prototypecount" value="${jdbc.prototypecount}"></property> 
  <property name="housekeepingsleeptime" value="${jdbc.housekeepingsleeptime}"></property> 
  <property name="simultaneousbuildthrottle" value="${jdbc.simultaneousbuildthrottle}"></property> 
  <property name="housekeepingtestsql" value="${jdbc.housekeepingtestsql}"></property> 
  <property name="verbose" value="${jdbc.verbose}"></property> 
  <property name="statistics" value="${jdbc.statistics}"></property> 
  <property name="statisticsloglevel" value="${jdbc.statisticsloglevel}"></property> 
</bean> 
  <!--数据源 读--> 
  <bean id="datasourcer" class="org.logicalcobwebs.proxool.proxooldatasource"> 
  <property name="alias" value="ihotelr"></property> 
  <property name="delegateproperties"> 
    <value>user=${jdbc.r.username},password=${jdbc.r.password} 
    </value> 
  </property> 
  <property name="user" value="${jdbc.r.username}" /> 
  <property name="password" value="${jdbc.r.password}" /> 
  <property name="driver" value="${jdbc.r.driverclassname}" /> 
  <property name="driverurl" value="${jdbc.r.url}" /> 
  <property name="maximumconnectioncount" value="${jdbc.maximumconnectioncount}"></property> 
  <property name="maximumactivetime" value="${jdbc.maximumactivetime}"></property> 
  <property name="maximumconnectionlifetime" value="${jdbc.maximumconnectionlifetime}"></property> 
  <property name="prototypecount" value="${jdbc.prototypecount}"></property> 
  <property name="housekeepingsleeptime" value="${jdbc.housekeepingsleeptime}"></property> 
  <property name="simultaneousbuildthrottle" value="${jdbc.simultaneousbuildthrottle}"></property> 
  <property name="housekeepingtestsql" value="${jdbc.housekeepingtestsql}"></property> 
  <property name="verbose" value="${jdbc.verbose}"></property> 
  <property name="statistics" value="${jdbc.statistics}"></property> 
  <property name="statisticsloglevel" value="${jdbc.statisticsloglevel}"></property> 
  </bean> 
  <!-- 动态数据源 --> 
  <bean id="dynamicdatasource" class="com.dao.datasource.dynamicdatasource"> 
  <!-- 通过key-value关联数据源 --> 
  <property name="targetdatasources"> 
    <map> 
    <entry value-ref="datasourcerw" key="datasourcekeyrw"></entry> 
    <entry value-ref="datasourcer" key="datasourcekeyr"></entry> 
    </map> 
  </property> 
  <property name="defaulttargetdatasource" ref="datasourcerw" />   
  </bean> 
<!--mybatis与spring整合 开始 --> 
<bean id="sqlsessionfactory" name="sqlsessionfactory"
  class="org.mybatis.spring.sqlsessionfactorybean"> 
  <property name="configlocation" value="classpath:conf/core/sqlmapconfig.xml" /> 
  <property name="datasource" ref="dynamicdatasource" /> 
</bean>

protected abstract object determinecurrentlookupkey();

public class dbcontextholder { 
  /** 
   * 线程threadlocal 
   */
  private static threadlocal<string> contextholder = new threadlocal<>(); 
  private string db_type_rw = "datasourcekeyrw"; 
  private string db_type_r = "datasourcekeyr"; 
  public string getdbtype() { 
  string db = contextholder.get(); 
  if (db == null) { 
    db = db_type_rw;// 默认是读写库 
  } 
  return db; 
  } 
  /** 
   * 设置本线程的dbtype 
   * @param str 
   * @see [相关类/方法](可选) 
   * @since [产品/模块版本](可选) 
   */
  public void setdbtype(string str) { 
  contextholder.set(str); 
  } 
  /** 
   * cleardbtype 
   * @title: cleardbtype 
   * @description: 清理连接类型 
   */
  public static void cleardbtype() { 
  contextholder.remove(); 
  } 
}

public class dynamicdatasource extends abstractroutingdatasource { 
  /* 
   * (non-javadoc) 
   * @see javax.sql.commondatasource#getparentlogger() 
   */ 
  @override 
  public logger getparentlogger() throws sqlfeaturenotsupportedexception { 
  // todo auto-generated method stub 
  return null; 
  } 
  /** 
   * override determinecurrentlookupkey 
   * <p> 
   * title: determinecurrentlookupkey 
   * </p> 
   * <p> 
   * description: 自动查找datasource 
   * </p> 
   * @return 
   */
  @override
  protected object determinecurrentlookupkey() { 
  return dbcontextholder.getdbtype(); 
  } 
}

/** 
   * 添加邮件 
   * @param sms 
   * @return 
   */
  public boolean insertemail(email email) { 
  //根据具体需要设置不同的数据库 
  dbcontextholder.setdbtype(dbcontextholder.db_type_rw); 
  //dbcontextholder.setdbtype(dbcontextholder.db_type_r); 
  int result = this.getsqlsession().insert(statement + ".addentity", 
    email); 
  return result == 1; 
  }